Dielectron production in C-12+C-12 collisions at 2-AGeV with HADES

Agakichiev, B.; Kienle, P.; Naumann, L.; Garzon, J. A.; Fateev, O.; Pachmayer, Y.C.; Kastenmuller, A.; Sapienza, P.; Przygoda, W.; Reshetin, A.; Duran, I.; Wisniowski, W.; Spruck, B.; Lang, S.; Roy-Stephan, M.; Tsertos, H.; Pospisil, V.; Kulessa, R.; Fabbietti, L.; Pleskac, R.; Bellia, G.; Simon, R. S.; Bokemeyer, H.; Zanevsky, Y.; Novotny, J.; Stroth, J.; Traxler, M.; Rustamov, A.; Malarz, A.; Chernenko, S.; Smykov, L.; Cabanelas, P.; Metag, V.; Toia, A.; Zeitelhack, K.; Kajetanowicz, M.; Otwinowski, J.; Fernandez, C.; Wagner, V.; Ierusalimov, A.; Schon, H.; Perez, T.; Boyard, J. L.; Schroder, C.; Maiolino, C.; Pietraszko, J.; Mousa, J.; Jaskula, M.; Markert, J.; Dohrmann, F.; Korner, H. J.; Walus, W.; Schon, W.; Bertini, D.; Sturm, C.; Ramstein, B.; Bohmer, M.; Lange, S.; Sudol, M.; Diaz, J.; Krucken, R.; Kolb, B. W.; Schmah, A.; Kampfer, B.; Salabura, P.; Gonzalez-Diaz, D.; Kurepin, A.; Ploskon, M.; Munch, M.; Magestro, D.; Suk, M.; Sanchez, M.; Prokopowicz, W.; Bielcik, J.; Lins, E.; Schwab, E.; Holzmann, R.; Friese, J.; Sailer, B.; Ritman, J.; Iori, I.; Spataro, S.; Sadovsky, A.; Hlavac, S.; Eberl, T.; Wustenfeld, J.; Hennino, T.; Garabatos, C.; Zovinec, D.; Alvarez-Pol, H.; Kugler, A.; Strobele, H.; Kuhn, W.; Balanda, A.; Ivashkin, A.; Nekhaev, A.; Vassiliev, D.; Koenig, W.; Tlusty, P.; Christ, T.; Finocchiaro, P.; Gernhauser, R.; Smolyankin, V.; Enghardt, W.; Coniglione, R.; Vazquez, A.; Guber, F.; Cosentino, L.; Kotte, R.; Taranenko, A.; Agodi, C.; Jurkovic, M.; Lehnert, J.; Frohlich, I.; Fuentes, B.; Muntz, C.; Grosse, E.; Koenig, I.; Piattelli, P.; Wojcik, T.; Kagarlis, M.; Braun-Munzinger, P.; Kanaki, K.; Pechenov, V.; Homolka, J.; Karavicheva, T.; Kidon, L.; Zumbruch, P.; Golubeva, M.

doi:10.1103/PhysRevLett.98.052302

Journal Article

Dielectron production in C-12+C-12 collisions at 2-AGeV with HADES

Agakichiev, B. ; Agodi, C. ; Alvarez-Pol, H. ; Balanda, A. ; Bertini, D. ; Bielcik, J. ; Bellia, G. ; Bohmer, M. ; Bokemeyer, H. ; Boyard, J. L. ; Braun-Munzinger, P. ; Cabanelas, P. ; Chernenko, S. ; Christ, T. ; Coniglione, R. ; Cosentino, L. ; Diaz, J. ; Dohrmann, F. ; Duran, I. ; Eberl, T. ; Enghardt, W. ; Fabbietti, L. ; Fateev, O. ; Fernandez, C. ; Finocchiaro, P. ; Friese, J. ; Frohlich, I. ; Fuentes, B. ; Garabatos, C. ; Garzon, J. A. ; Gernhauser, R. ; Golubeva, M. ; Gonzalez-Diaz, D. ; Grosse, E. ; Guber, F. ; Hennino, T. ; Hlavac, S. ; Holzmann, R. ; Homolka, J. ; Ierusalimov, A. ; Iori, I. ; Ivashkin, A. ; Jaskula, M. ; Jurkovic, M. ; Kagarlis, M. ; Kajetanowicz, M. ; Kampfer, B. ; Kanaki, K. ; Karavicheva, T. ; Kastenmuller, A. ; Kidon, L. ; Kienle, P. ; Koenig, I. ; Koenig, W. ; Korner, H. J. ; Kolb, B. W. ; Kotte, R. ; Krucken, R. ; Kugler, A. ; Kuhn, W. ; Kulessa, R. ; Kurepin, A. ; Lang, S. ; Lange, S. ; Lehnert, J. ; Lins, E. ; Magestro, D. ; Maiolino, C. ; Malarz, A. ; Markert, J. ; Metag, V. ; Mousa, J. ; Munch, M. ; Muntz, C. ; Naumann, L. ; Nekhaev, A. ; Novotny, J. ; Otwinowski, J. ; Pachmayer, Y. C. ; Pechenov, V. ; Perez, T. ; Piattelli, P. ; Pietraszko, J. ; Pleskac, R. ; Ploskon, M. ; Pospisil, V. ; Prokopowicz, W. ; Przygoda, W. ; Ramstein, B. ; Reshetin, A. ; Ritman, J.FZJ* ; Roy-Stephan, M. ; Rustamov, A. ; Sadovsky, A. ; Sailer, B. ; Salabura, P. ; Sanchez, M. ; Sapienza, P. ; Schmah, A. ; Schon, H. ; Schon, W. ; Schroder, C. ; Schwab, E. ; Simon, R. S. ; Smolyankin, V. ; Smykov, L. ; Spataro, S. ; Spruck, B. ; Strobele, H. ; Stroth, J. ; Sturm, C. ; Sudol, M. ; Suk, M. ; Taranenko, A. ; Tlusty, P. ; Toia, A. ; Traxler, M. ; Tsertos, H. ; Vassiliev, D. ; Vazquez, A. ; Wagner, V. ; Walus, W. ; Wisniowski, W. ; Wojcik, T. ; Wustenfeld, J. ; Zanevsky, Y. ; Zeitelhack, K. ; Zovinec, D. ; Zumbruch, P.

2007
APS College Park, Md.

Physical review letters 98, 052302 (2007) [10.1103/PhysRevLett.98.052302]

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Please use a persistent id in citations: http://hdl.handle.net/2128/7763 doi:10.1103/PhysRevLett.98.052302

Abstract: The invariant-mass spectrum of e(+) e(-) pairs produced in C-12 + C-12 collisions at an incident energy of 2 GeV per nucleon has been measured for the first time. The measured pair production probabilities span over 5 orders of magnitude from the pi(0)-Dalitz to the rho/omega invariant-mass region. Dalitz decays of pi(0) and eta account for all the yield up to 0.15 GeV/c(2), but for only about 50% above this mass. A comparison with model calculations shows that the excess pair yield is likely due to baryon-resonance and vector-meson decays. Transport calculations based on vacuum spectral functions fail, however, to describe the entire mass region.

Keyword(s): scattering: heavy ion ; carbon ; electron: pair production ; mass spectrum: (positron electron) ; model: production ; pseudoscalar meson: decay ; vector meson: decay ; spectral representation ; quantum molecular dynamics: relativistic ; magnetic spectrometer: experimental results ; Darmstadt SIS ; 1-2 GeV/nucleon